BTT TMC5160 PLUS tuning parameters

[Muz94]

Now that I think about, I also tested the motors with the 36V PSU, so that should have eliminated the ground loop
I’ll try switching back to the 36v psu to make a more precise comparison.
And maybe I should find a way to delay power to the 24v psu (any good ideas? i’d like to avoid adding another relay)

[mykepredko]

@Muz94

Now that I think about, I also tested the motors with the 36V PSU, so that should have eliminated the ground loop
I’ll try switching back to the 36v psu to make a more precise comparison.

How did you wire the 36V PSU before? How are you planning on doing it now?

The experiment I outlined above should take less than ten minutes and it should inform us if there is a possible ground loop problem.

[Muz94]

I just took the 2 wires going to the 24v PSU and plugged them into the 36V one.
Maybe I should unplug the Y axis motor from the board, as that might create another loop.

[mykepredko]

Please draw out what you’re proposing so we can ensure we’re talking about the same thing.

[Muz94]

[mykepredko]

That looks good!

Let me know how it works for you.

[Muz94]

A few updates:

Tried again with the 36V psu: very minor improvement both with StealthChop and SpreadCycle, probably more related to the different voltage than to the removal of the ground loop. The problem is still there.

I received these resisors (code WSLT2512R1000FEA)
I took the spare driver I had laying around and replaced the 2 resistors. I then replaced the driver of the “worst” (in terms of vibrations) of the X axis motors with the modified one (i didn’t want to risk bending the gantry in case of malfunctioning, so I didn’t put it on the Z axis) and:
1 - It seems to make a very noticeable improvement (let’s say that now that motor sounds similar to the other X axis one).
2 - It still doesn’t fix the issue completely
3 - With the modified driver I get random “short to supply A” TMC errors when I jog the axis (It homes just fine, but fast movements sometimes trigger that error). I guess that replacing those 2 resistors is not enough, or maybe those 1% cinese resistors are not good enough, or maybe it’s my crappy soldering job (it’s not so bad tho), or maybe IDK.

I’m just tired of losing time on this issue, now on 36v the sound on spreadcycle is quite decent, so i think I’ll avoid stealthchop and stick with that…

The only thing that bothers me is that the motors seem to get hotter with these drivers. Maybe I should try reducing hold_current.

The driver: